Sash-balancing device.



W. SAWYER.

SASH BALANCING DEVICE. 1

APPLICATION FILED 0015, 1910.

1,014,182, Patented Ja1 1.9, 1912.

f 7/ P17 J mmmwmmm l 8 Q Vi Menus 06 4 fiiimi/z flaw 5/7 %,4. ,5 F v d lv W I GHQ mm WILLIAM sawvnn, or ARMSIRONG, Bn 'rtsn COLUMBIA, CANADA.

Specification of Letters Patent.

SASH-BALANGING DEVICE.

Patented Jan. 9,1912.

Application filed October 5, 1910. Serial No. 585,482.

To all whom it may concern:

Be it known that 1, WILLIAM SAwYnR, a subject of the King of GreatBritain, residing at Armstrong, county of Yale, in the Province ofBritish Columbia, Dominion of Canada, have invented a new and usefulSash-Balancing Device, of which the following is a specification.

This invention has reference to improvements in sash balancing devices,and its object is to provide a simple means whereby a window sash may bemoved toany desired position and will be there held without thenecessity of counterbalancing weights, and thereby avoiding the boxingusually provided for accommodating such weights.

In accordance with the present invention the window sash is sustained ateach side by a strand or strands secured at the ends to the sash andinterwoven around pulleys carried by the sash and casing, or either ofthem, in such manner that the tension on the strands is sufiicient tocounteract any tendency of the sash to gravitate to the lower positionwhen-once raised, so that the sash will maintain. any raised position towhich it may be moved. I

The invention will be best understood from a consideration of thefollowing detailed description, taken in connection with theaccompanying drawings, forming a part of this specification, with theunderstanding, however, that while the showing of the drawings is of apractical embodiment of the invention,'the latter is susceptible tovarious modifications or changes, and is, therefore, not confined to theexact showing of the drawings, but the practical embodiments of theinvention may vary from such showing so long as the salient features areretained.

In the drawings :-Figure 1 is a vertical section of a window casing anda portion of a window sash with the invention applied, the sash beingshown laterally displaced fromthe corresponding portion of the casing tobetter illustrate the course of the sustaining strand or strands. Fig. 2is a similar view but with the sash in proper relation to the windowframe and in the highest position. Fig. 3 is a view similar to Fig. 1but showing a modified form of the sustaining strand structure. Figs. 4and 5 aredetailed sections of pulleys and'brackets therefor used inconjunction with the invention.

Referring to the drawings there is shown a window frame 1 which may beof ordinary construction except that the customary boxing for the sashbalancing weights is omitted as unnecessary. Only one side and 'aportion ofthe length of the window frame are shown in the drawings, butit will be understood that the device of the present invention isapplied'to both sides of the winan angle bracket 5 strengthened by sidewings 6 to form an angular casing. Traversing the space between thewings 6 and secured to these wings is a pintle or rod 7 on which ismounted a roller 8. Other brackets 9, 10, 11 are provided and each ofthese brackets has spaced wings 12 in parallel relation carrying a pin13 traversing the space between the wings 12 and secured at the ends tothese wings. Mounted on each pin 12 is a roller 14 similar to the roller8.

In'the particular structure shown in Figs. 1 and 2 a strand .15 is madefast to the window sash within the channel 4 at an appropriate distancebelow the top of the sash. This strand is carried about the pulleywithin the bracket 9, the latter being secured to the frame 1 betweenthe guide strips 2 at an appropriately low point, and from the pulleybracket 9 the strand 15 is continued upwardly along the frame 1 to andaround the pulley S'and from thence is directed to the topof the sash 1where it is secured close to the corresponding corner of the sash. Alsosecured tocthe top of the sash adj acent to the point of securing of thestrand 15 is another strand 16 which is carried to and around the roller8 and thence to the roller bracket 11, which is located below the top ofthe sash an appropriate distance, thence the strand 16 is carried upwardthrough the channel 4 to the roller in the bracket 10, which bracket islocated near the upper end of the channel 4, and from this last namedroller the strand 16 is carried to the strand 15 to which it is p unitedin any appropriate manner so that the strand 16 coalesces with thestrand 15 and they become as one strand from this point around thepulley within the bracket 9 to the point of connection with the sash.

Instead of the arrangement shown in Figs. 1 and 2, the'arrangement ofFig. 3 may be employed where a single strand instead of' two are used.In this case there is a strand 15 made fast tothe windowsash withinthechannel 4 closeto the bracket 11, and this strand is carried to andaround the pulley 14 within thebracket 9, thence to and around thepulley within the bracket 10 on the window sash, thence-to and aroundthe pulley within the bracket 11 also on the window sash,-thence to andaround the pulley 8 in the upper corner of'the frame 1, and finally thisstrand is continued toand made fast at the .upper end'ofthe. windowsash.

The strandsof Figs. '1 or 3 are, of: course, present at bothsides of thesash and frame, but. since. the operation of the invention is clear fromthetshowing of one side only of the sash and frame, the drawings areconfinedto such showing.

The tension of'the strands of Fig. l or the strand of Fig. 3 isdependent upon the weight of the sash, the heavier the sash the greaterthe initial tension on the strand. It

tion of gravity, but will-maintain the positi to whichit may bemoved,such movementsbeing. readily accomplished since the sash is in a moreorless balanced-condition, and. but little force is needed for. causingsuchmovement of the sash. Neither is there any markedfrictionbetweenparts so that neither the strandsnor pulleys wear perceptibly duringlong intervals of time. 7

It'will beunderstood, of course, that the channel 4 will accommodate thepulleys and strands and may aswell be formed in the It will ments of thepulleys, whether-on the sash or' on the window frame, may-be employed.

While-usually sash,- cord is employed for the flexible strands, thisdoes not preclude the use of metal strands of various kinds, such asflexible wires. or bands or chains where the use. of suchmaterials isdesirable, this being especially-true where-the weights are heavy.

In the showingof Figs. v1-and2, the double strands 15 and 16 are adaptedmore. particularly for heavy-sash and-where the sash is light, a single.strand asimthe showing'of Fig. 3 willbefound eflicient, and thismaybeeven. used for heavy sash providing the The numerous changes inthe-direction of the strand causes-the'same to be put under such;tension asto overcome theiweight of the sash, so that it will remain inthe posicasing, so that there is no interference with the movement ofthe sash because of the presence of these brackets. I

The application of the invention to windows requires simply theproduction of a groove in thesash or in the window frame,

but preferably in the sash throughout the length of the latter to housethe brackets 10 and 11 and to permit the extension of the bracket 9 intothe same groove.

The use of the brackets 9, 10, 11. necessitates simply the production ofa longitudinal groove in each side of the sash for the and accommodationofthe brackets strands, such grooves being Very readily produced whilethe cutting of the sash or casing for the insetting of brackets beyondthe line of the strands is wholly avoided.

The use of the present invention avoids the necessity of any exactcounterbalancing of the weight of the sash as in the case of isashbalancing weights as commonly em- ;ployed, and while the invention hasbeen vdescribed as useful in connection with window sashes it will beunderstood that it may be used wherever any object is to be adfjustablysustained to be elevated or lowered iwith minimum. exertion. Therefore,while the word sash is used bothin the description and claims it is notintended that the invention shall be limited to application :to sashesonly, but the term is to include any ;object to which the invention maybe op- :eratively applied.

What isclaimed is I I 1. A counterbalancing means for a movable sash andhaving the middle portion passed about the pulleys carried by themovable sash, and between such middle portion and the-respective ends ofthe strand passed about the fixedly sustained pulleys.

2. The combination with a sash, of a balancing means therefor comprisingspaced pulleys on the sash and other spaced pulleys sustained fixedlywith relation to the sash and more widely separated than the pulleys on.the sash, and aflexible strand conof the sash about one of the fixedlysupportedpulleys, thence to the lower one of the able sash comprisingpulleys carried by the lmovable sash, other pulleys sustained in fixedrelation to the movable sash, and a strand connected at both ends to themovspaced pulleys on the sash, thence about the upper one of the spacedpulleys on the sash, and thence about the other one of the fixedlysupported pulleys.

3. The combination with a sash having a longitudinal side groove, of aframe in which the sash is movable, spaced pulleys lodged in the groovein the sash in spaced relation one to the other, a pulley fixedlysupported in the frame near the upper end thereof, another pulley belowthe first named pulley and spaced'therefrom a distance permitting thelowering of the sash to its full extent without interference by thepulleys carried by the sash, and a flexible strand connected at one endto the upper part of the sash and at the other end in the groove belowthe lower one of the pulleys therein, said strand extending from the topof the sash about the pulley at the upper end of the window frame,thence to the lower one of the pulleys of the sash, thence to the upperone of said pulleys on the sash, thence about the lower pulley on thewindow frame, and finally returning and secured to the sash.

4. The combination with a sash having a longitudinal side groove, of aframe in which the sash is movable, spaced pulleys lodged in the groovein the sash in spaced Copies of this patent may be obtained for relationone to the other, a pulley fixedly thence. about the lower pulley of theframe and finally returning and secured to the window sash below thelower pulley thereon, and another strand connected to the upper end ofthe sash and passing thence about the pulley at the upper end of theframe, and thence about the lower and upper pulleys on the sash in orderand thence to the first named strand and there coalescing with thelatter and by it continued about the lower pulley on the frame andultimately connected to the sash.

In testimony, that I claim the foregoing as my own, I have heretoaffixed my signature in the presence of two witnesses.

WILLIAM SAWYER.

Witnesses:

W. E. FOREMAN, H. C. ARMSTRONG.

five cents each, by addressing the Commissioner of Patents, Washington,D. G.

